Recycling and utilisation of carbon and nutrients to land – University of Copenhagen

ReUseWaste > Research > WP6 Nutrient recycling

Recycling and utilisation of carbon and nutrients to land

The aim of this work package is:

  • To improve and test land application methods of new manure treatment products and bio-fertilisers and to assess their effect on gaseous emissions
  • To assess the effect of new manure treatment products and bio-fertilisers on crop nutrient value and soil quality

Background

The manure potential as soil amendment, crop fertiliser or environmental pollutant depends on its composition and management, as well as on soil and environmental conditions. Manure treatment and separation technologies developed (in WP4 and 5) to solve problems of the limited area for manure application in high density animal farms led to new manure streams (e.g. liquid fraction and anaerobic digestate) and solid bio-fertilisers (e.g. enriched composts).

Application methods for these new manure products have to be evaluated in terms of fertiliser value, adjusted and improved under relevant local climatic and soil conditions, in order to be considered appropriately in farmers fertiliser plans according to the crop requirements (Moral et al., 2009).

Some slurry treatments used to decrease gaseous emissions in the animal house or storage (e.g. acidification or addition of urease and nitrification inhibitors) may lead to an increase of gaseous emissions after soil application (Fangueiro et al., 2008b; Bertora et al., 2008) or to a decrease of nutrients (N and P) availability to plants. A combined treatment of slurry by subsequent separation may impact nutrient turnover and loss after soil application of the separation products, and this has to be considered carefully (Fangueiro et al., 2007; Trindade et al., 2009).

Best agronomic practices may be developed by calibrating simulation models on experimental data (lab and field) for the new manure products or bio-fertilisers developed from these. With the calibrated simulation mo­dels new scenarios for manure nutrients and organic matter can be run (Bruun et al., 2006).

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